.flash-btn {
    background: linear-gradient(135deg, #343a40, #212529);
    color: white !important;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 10px;
    font-weight: 600;
    padding: 10px 16px;
    transition: all 0.2s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
}

    .flash-btn:hover:not(:disabled) {
        color: white !important;
        background: linear-gradient(135deg, #495057, #2b3035);
        transform: translateY(-1px);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    }

    .flash-btn.flash-on {
        background: linear-gradient(135deg, #ffc107, #ff9800);
        color: #212529 !important;
        box-shadow: 0 0 12px rgba(255, 193, 7, 0.55);
    }

        .flash-btn.flash-on:hover:not(:disabled) {
            color: #212529 !important;
            background: linear-gradient(135deg, #ffd54f, #ffa726);
        }

    .flash-btn:disabled {
        opacity: 0.45;
        cursor: not-allowed;
    }